Loud speaker construction



g- 1932- P. G. ANDRES ET AL 1,871,107

LOUD SPEAKER CONSTRUCTION Filed June 15, 1929 5 Sheets-Sheet 1 Aug. 9, 1932- 'P. G. ANDRES ET AL LOUD SPEAKER CONSTRUCTION- Filed June 15, 1929 5 Sheets-Sheet "2 Aug. 9, 1932. P. G. ANDRES ET AL 1,371,107 LOUD SPEAKER CONSTRUCTION Filed June 15 1929 3 Sheets-Sheet 5 1777062 E5211? (3, fidres 1 7126? Z617 fmr Patented Aug. 9, 1932 UNITED STATES,

DELAWARE PATENT OFFICE i PAUL e. ANDRES, OF LA GRANGE, AND FEED w. TEMPLE, s'r. CHARLES, ILLINOIS, ASSIGNORS TO TEMPLE CORPORATION, oEcHIcAeo, ILLINOIS, A coEro ATIoN- or LOUD srEAKEE cousrnuc'rrou Application filed June :15,

Our invention relates to loud speakers, and has among its other objects the production of devices of the kind described which are compact, durable and simple in construction,

A particular object of the invention is to provide a loud speaker which can be easily and quickly assembled and in which the parts will remain in perfect alinement even though subjected to hard usage.

A preferred embodiment of the invention comprises an improved magnetizing structure having an intense annular magneticfield in which a coil subjected to telephonic currents is positioned, the coil being mounted by improved meansto vibrate in the magnetic field and being adapted to impart these vibrations to a diaphragm which is-connected to it.

Many other objects and advantageswill appear as this description progresses, reference being had to the accompanying drawings, wherein:

Fig. 1 is a central vertical sectiontaken -25; through a loud speaker which embodies the invention.

Fig. 2 is a section taken on line 2-2 of Fig. 1. V

Fig. 3 is a section taken on line 33 of Fig. 4 is a perspective view of certain magnet and frame members which form parts of the improved loud speaker, and I Fig. 5 is a perspective view, partly in section, of two pole pieces which form parts of 35' the improved loud speaker. V 7

As set forth above, our improved loud speaker preferably comprises a magnetizing structure. Thus, as shown in Fig. 1, we preferably provide an electro-magnet whichflcom- 4c prises U-shaped magnet members 10 and 11 disposed in opposed relation, the construction being such that the ends ofthe members 10 and 11 are arranged in pairs. It will be noted that a relatively large aperture 13 is formed in one pair of the opposed ends of the magnet members 10 and 11, and that asmaller aperture 14 is formed through the other pair. Disposed between the members 10 and 11 is a pole piece 15 which is rigidly secured to the members 10 and 11 by a bolt 16, the bolt 1929. Serial No. 371,243.

16 being screw threaded into the pole piece 15 and being arranged to pass through the aperture 14. It will be noted that the mem-i bers .10 and 11 are clamped between the pole piece 15 and a washer 18 positioned upon the bolt 16.]

Disposed around the polepiece 15 is a winding 20 adapted to energize the pole piece 15 and the magnet members 10 and 11. The

front end of the pole piece 15 projects through theaperture 13 and is preferablyfof'reduced diameter. Disposed around and rigidly seformed from paper or alphenolidoondensa tion. product. The sleeve 31: is preferably 'provided'with'a groove 32 to receive the winding and the sleeve 31 is preferably secured in a relatively large aperture 33 formed in a sheet35, the sheet 35 being formed from anysuitable flexible material, such as formica; v In reality, the sleeve 31 is mounted on the free ends of aplurality of flexible arms 36 formed by'stamping slots 37 in the sheet 35 (seeFig. 7). The sheet 35 is mounted upon: a plurality of bolts 40 which are screw" threaded into apertures 42 provided in the members 10 and11. {(See Fig.4.)

. The above described construction permits 7 the sleeve 31, together with the winding 30, to

Secured to the outer end of the sleeve 31 is a conical diaphragm 42 which is preferably formed from paper, or the equivalent, the apices of the cone being cut away and a portion of the diaphragm being bent backwards into the cone to provide an annular flange 43 which is preferably secured to the sleeve 31 by adhesive. The outer edge of the conical diaphragm 42 is secured to an annular flexible' member '44 which is preferably formed from. relatively thin flexible leather, or the equivalent, the construction being such that the cone 42 and the member 44 together con= stitute the diaphragm for the loud speaker. The outer edge of the annular member 44 is rigidly secured to a ring 47 stamped from sheet metal, the ring 47 being 'carried'by a plurality of U-shaped arms or brackets" 49 which are preferably stamped from sheet metal and have their ends spot-welded to the ring 47. Referring to Figs. 5 and 6, it will be noted that the arms or brackets 49 are secured'to the magnet members 10 and '11 by the bolts 40. H

The means for securing the outer edge of the annular member 44 to the ring 47 com-' prises a plurality of bolts 50 which are employed to clamp the annular members 44 betweenthe ring 47 and an annulus 48. An"

annular member 52 preferably formed of felt, or the equivalent, is preferably secured to the front surface of the annulus 48 by adhesive,

or the like, which annular member 52 forms a substantially air -tight joint when he loud speaker is positioned against a baffle.

'The loud speaker is preferably supported by bracket or frame members 56-and 57 to which the magnetmembers lQ'a'nd 11 are rigidly secured by the bolts 40 and screws 40. The members 56 and 57 preferably comprise upright portions substantially U-shaped, in: cross-section, flanges 57 on the'upright portions being provided with apertures'57 for the bolts 40 and the screws 40 At the lower ends of the brackets or frame members 56'and' 57f outwardly extending flanges 57- arefpro' vided, which flanges are apertured, at 5T ,so that the bracket members may be secured to a suitable support. 7

A feature of the invention is the employ ment of the bolts 40't0 secure the frame mem-J bers 56 and 57 the U-shaped bracket members 49 and the sheet 35 to the magnet members 10 and 11. This construction permits the apparatus to be quickly and easily, assem-' bled and insures that the several parts will remain in correct alinement.

While we have shown and described certain embodiments of ourinvention, it is tobe,

understood that it is capable of many modi-V -fications. Changes, therefore,'in the construction and arrangement may be "made without departing from the spirit and scope all novelty inherent in our invention as broadly as possible, in view of the prior art.

What we claim as new is:

1. A device of the kind described comprising a pair of U-shaped magnet members disposed in opposed relation, one pair of ends ofsaid magnet members being provided with a relatively large aperture therethrough, and the other pair of ends of said magnet members being provided with a relatively small aperture therethrough, a pole piece disposed between said magnet members and projecting through said relatively large aperture, means projecting through said relatively small aperture for securing said pole piece to said magnet members, a ring ofnonanagnetie material carried by'said pole piece, an an; nular pole piece carried by saidring and fitting saidrelatively large aperture, a Winding disposed between the first mention-ed v pole piece and said annular pole piece, a sleeve carrying saidwinding, flexible means supporting said sleeve, and a diaphragm operatively connected to said sleeve. r i

2. A device of the kind described comprising a magnet having an annular magnetic field, frame members, a winding disposed in said annular field, a sleeve for carrying said winding, a plurality of flexible arms carrying said'sleeve, a diaphragm operatively connected to said sleeve, means for supporting said diaphragm, and common means for securing said frame members, said flexible arms and said supporting means tosaid magnet.

I 3.: A device of the kind described comprising a magnet having an annular magnetic" field, frame members, a winding disposed in said ann lar field, a sleeve for Carrying said winding, a plurality of flexible arms carrying said sleeve, a diaphragm operatively connected to said sleeve, means for supporting said diaphragm, and common means for securing said frame members and saidsup porting m ans to said magnet. Y Y 4., A'device of the kind described comprising a magnet having an annular magneticfield, frame members, a winding disposed in saidannular field, a sleevefor carrying said winding, a plurality of flexible-arms carrying said sleeve, a, diaphragm operatively connected to said sleeve, means'for supporting said diaphragm, and common means for securing saidff'rame members and said flexible means to said magnet. r

In testimony whereof, we have hereunto set our hands, this 17th day of May, 1929.

i PAUL G. ANDRES.

7 RED W. TEMPLE f the invention as disclosed in the'appended' claims, in which it is our intention to claim 

